Figure 1.

Representative case of intracranial lesion geometry and translesional pressure measurements. In this patient, (A) the minimal lumen diameter was 0.69 mm, and the normal segment diameter was 4.12 mm, so the stenosis was calculated as 83.3%, and the lesion length was 7.53 mm; (B) the mean distal pressure (Pd) was 66 mmHg; (C) the mean proximal pressure (Pa) was 95 mmHg. The translesional pressure gradient radio (Pd/Pa) and translesional pressure gradient difference (Pa–Pd) were thus found to be 0.69 and 29 mmHg.